This lesson taught by Marty Schwartz in the video lesson below, is played in standard tuning with a capo on the second fret. I am sure you already know what a capo is. If not, follow this link for a lesson on how to use a guitar capo.
So, the guitar chord shapes you are going to need to know for this song are: G Major, G/F#, E Minor, C Major and D Major. Marty gives us another excellent lesson here, especially catered toward beginners.
Someone Like You Acoustic Guitar Lesson
As Performed by Adele